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Blocklength-Limited Performance of Relaying under Quasi-Static Rayleigh Channels
RWTH Aachen University.
RWTH Aachen University.
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0001-6682-6559
2016 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248Article in journal (Refereed) Epub ahead of print
Abstract [en]

In this paper, the blocklength-limited performance of a relaying system is studied, where channels are assumed to experience quasi-static Rayleigh fading while at the same time only the average channel state information (CSI) is available at the source. Both the physical-layer performance (blocklength-limited throughput) and the link-layer performance (effective capacity) of the relaying system are investigated. We propose a simple system operation by introducing a factor based on which we weight the average CSI and let the source determine the coding rate accordingly. In particular, we show that both the blocklengthlimited throughput and the effective capacity are quasi-concave in the weight factor. Through numerical analysis, we investigate the relaying performance with average CSI while considering perfect CSI scenario and direct transmission as contrasts. We observe that relaying is more efficient than direct transmission in the finite blocklength regime. Moreover, this performance advantage of relaying under the average CSI scenario is more significant than under the perfect CSI scenario. Finally, the speed of convergence (between the blocklength-limited performance and the performance with infinite blocklengths) in relaying system is faster in comparison to the direct transmission under both the average CSI scenario and the perfect CSI scenario.

Place, publisher, year, edition, pages
IEEE , 2016.
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-184882DOI: 10.1109/TWC.2016.2542245ISI: 000381502100005ScopusID: 2-s2.0-84978827227OAI: diva2:917424
ICT - The Next Generation

QC 20160408

Available from: 2016-04-06 Created: 2016-04-06 Last updated: 2016-09-20Bibliographically approved

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